pattern for grinding optical lenses, aka pattern for grinding optical lenses, grinding, optical, lens, and optics
A diagram detailing how to grind quartz crystals into light-bending optics. Neat!
It tells you how to make a quartz lens with the following components:
Making this would take good familiarity with craft.
In the upper right corner is a note: 'First discovered by Dr. mechanic.'
It weighs about 100 grams. It is a electromechanical schematic. You have no idea what it might be worth.